获取el-select选中的下标

accountZbList:[ ]:下拉列表已通过接口获取数据

<el-row>
						<el-col :span="12">
							<el-form-item label="账簙" prop="accountTook" class="itemzb">
								<el-select v-model="tableForm.accountTook" placeholder="请选择" clearable filterable
									@change="getOrg($event)">
									<el-option v-for="item in accountZbList" :key="item.code" :label="item.name"
										:value="item.code">
										<span
											style="float: right; color: #8492a6; font-size: 13px">{{ item.name }}</span>
										<span style="float: left">{{ item.code }}</span>
									</el-option>
								</el-select>
							</el-form-item>
						</el-col>
						<el-col :span="12">
							<el-form-item label="核算组织" prop="hszz">
								<el-input v-model="tableForm.hszz" disabled placeholder="请输入"
									style="min-width: 217px;" />
							</el-form-item>
						</el-col>
					</el-row>


methods:{

		//取到选中的下标再找到，再赋值给核算组织
			getOrg(val) {

				if (val) {
					//遍历帐簙列表的值与选中的值相等的下标
					let num = this.accountZbList.findIndex((item, index) => {
						return item.code == val
					})
					console.log(num) //下标123....
					this.tableForm.hszz = this.accountZbList[num].org  //赋值给核算组织
				} else {
					return
				}
			},
}